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Nonlinearly viscoelastic response of...

Zhu, Weidong.

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Nonlinearly viscoelastic response of glassy polymers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nonlinearly viscoelastic response of glassy polymers./
作者:	Zhu, Weidong.
面頁冊數:	114 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1539.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3045469
ISBN:	0493592822

Nonlinearly viscoelastic response of glassy polymers.
Zhu, Weidong.

Nonlinearly viscoelastic response of glassy polymers. - 114 p.

Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1539.

Thesis (Ph.D.)--California Institute of Technology, 2002.

The nonlinearly thermo-mechanical creep behavior of (bisphenol A) polycarbonate under pure shear loading at different temperatures (0°C to 140°C) was investigated. The shear creep tests were conducted on an Arcan specimen geometry at different temperatures and under different stress levels, utilizing digital image correlation for the recording of the creep strains. The difference between the nominal stress and the actual stress distribution in the Arcan specimen was explored via numerical simulations (ABAQUS) by assuming linear quasi-elastic and quasi-plastic analysis in place of the as yet uncertain material characterization. Isochronal plots were created from the creep data. Nonlinearly viscoelastic behavior starts to take effect near 1% strain at the temperatures considered. The applicability of the stress-clock representation for material characterization is found to be dubious, at best, for this material. The “yield-like” behavior of polycarbonate has been examined in terms of the isochronal stress-strain response and a corresponding “yield-like shear stress” has been determined to be a monotonically decreasing function of the temperature, but with an interruption at the β transition temperature. Time-temperature trade-off as practiced for “time-temperature shifting” at small strains does not apply in the nonlinear domain.

ISBN: 0493592822Subjects--Topical Terms:

783786
Engineering, Mechanical.

Nonlinearly viscoelastic response of glassy polymers.
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245 1 0 $a Nonlinearly viscoelastic response of glassy polymers.
300 $a 114 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1539.
500 $a Adviser: Wolfgang G. Knauss.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2002.
520 $a The nonlinearly thermo-mechanical creep behavior of (bisphenol A) polycarbonate under pure shear loading at different temperatures (0°C to 140°C) was investigated. The shear creep tests were conducted on an Arcan specimen geometry at different temperatures and under different stress levels, utilizing digital image correlation for the recording of the creep strains. The difference between the nominal stress and the actual stress distribution in the Arcan specimen was explored via numerical simulations (ABAQUS) by assuming linear quasi-elastic and quasi-plastic analysis in place of the as yet uncertain material characterization. Isochronal plots were created from the creep data. Nonlinearly viscoelastic behavior starts to take effect near 1% strain at the temperatures considered. The applicability of the stress-clock representation for material characterization is found to be dubious, at best, for this material. The “yield-like” behavior of polycarbonate has been examined in terms of the isochronal stress-strain response and a corresponding “yield-like shear stress” has been determined to be a monotonically decreasing function of the temperature, but with an interruption at the β transition temperature. Time-temperature trade-off as practiced for “time-temperature shifting” at small strains does not apply in the nonlinear domain.
520 $a Then the role of volumetric strain in nonlinearly viscoelastic behavior of polycarbonate was studied. The creep responses at 80°C under combined two-dimensional shear and tensile/compressive stress states were measured on Arcan specimens. Within the precision underlying the measurements it is found that the shear and normal strain components accumulate under creep in nearly constant ratios. It is demonstrated quite clearly that the addition of negative dilatational stress (or deformation) to pure shear leads to distinctly lower creep rates. The converse is true, if positive dilatational stresses are added, though not monotonically so.
590 $a School code: 0037.
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791 $a Ph.D.
792 $a 2002
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